In an MOT test what is the fail/pass yardstick for a catalytic convertor?

Cam

New member
Is it based solely upon whether the exhaust emissions measure up to standard? Which garages will test emission standard without MOT-testing the car?
My mechanic is talking about replacing it because he says there's something rattling around inside. But I don't want to replace it if the car will pass the test without that being done..
 
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